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Mistron®

Mistron® For effective pitch and stickies control throughout the papermaking process

Imerys highly lamellar Mistron® talcs are effective, natural solutions for pitch and stickies control.

Mistron® has a natural affinity for pitch and stickies

Mistron® has a high specific area and low surface energy and shows an affinity for organic substances such as wood pitch and stickies. Pitch and stickies, such as wood resins, adhesives, inks and waxes, also have a low surface energy. As low-surface energy substances naturally attract each other, talc attracts pitch and stickies onto its platelets, making them harmless and preventing them from agglomerating. 

Mistron® uses two mechanisms to combat pitch and stickies, depending on the size of the contaminant. 

Mistron pitch and stickies control mechanism
Small particles are adsorbed onto the organophylic surfaces of the Mistron® particle
Mistron pitch and stickies control mechanism
Larger particles are enveloped by the Mistron® particles

In both cases, the tacky nature of the contaminant is neutralized, eliminating felt and wire blocking problems as well as deposits on pressing and drying cylinders

Pitch and stickies are pacified at three levels during the papermaking process:

  • Talc is hydrophobic and remains on the surface: the talc-enveloped contaminants can therefore be evacuated during the flotation process. 
  • During cleaning, talc envelops stickies, increasing their density and making them easier to remove.
  • Any remaining contaminants leave the process in the finished paper

Mistron® can be added to the process at different points depending on processing factors, the nature of the fiber and the size of contaminants. It is chemically inert and will not disturb other process parameters or react with other additives. 

Mistron® is effective in both chemical and mechanical virgin pulp as well as deinked (DIP) and recycled fiber (RCF) pulp. 

It is ideal for newsprint SC and LWC paper, wood-free printing grades, tissue paper and board.

For even better performance, we recommend our cationized Mistron® grades for pitch and stickies control.

We offer a full range of bespoke formulation and technical and process support services to help you match the right mineral grade to your application requirement.

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